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st: using squared terms in IVreg

From   Josh Freely <[email protected]>
To   [email protected]
Subject   st: using squared terms in IVreg
Date   Tue, 19 Sep 2006 09:05:26 -0400 (EDT)

I am using ivreg to perform a 2 stage least squares 
analysis.  It turns out that the stage 1 outcome has a 
curvilinear relationship with the stage 2 outcome.  Does 
anyone know if it is appropriate to include a square of the 
stage 1 outcome in the stage 2 model?  Does Stata have 
another method for doing 2sls that might better account for 
this curvilinear relationship?
Thank you,
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